US3701678A
Expired / Lapsed
US
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Film for layer chromatography
Assignee: Merck Patent GmbH
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Filing: 1970-02-20
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Granted: 1972-10-31
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Expires: 1990-02-20
Abstract
Abstract COATED FILMS SUITABLE FOR LAYER CHROMATOGRAPHY ARE OBTAINED BY APPLYING THE ADSORBENT COATING TO A POLYESTER OR OTHER FLEXIBLE PLASTIC FILM WHOSE SURFACE IS COVERED WITH A THIN COHERENT COATING OF POLYMERIC TITANIUM DIOXIDE AND/ OR POLYMERIC ZIRCONIUM DIOXIDE.
Inventors
- 👤 Hubert Rossler
- 👤 Herbert Halpaap
- 👤 Knut Klatyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:59
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N30/93; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |